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st: Assessing true odds ratios in logistic regression models with interaction terms


From   Ashwin Ananthakrishnan <ashwinna@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Assessing true odds ratios in logistic regression models with interaction terms
Date   Tue, 7 Mar 2006 05:14:27 -0800 (PST)

Hi,

I'm having a fairly knotty problem with stata. Let me
give you a background before I ask the questions:

I have one outcome variable - screening test - yes or
no

I have four independent variables - gender (male,
female), income (3 categories - low, medium, high),
age (4 categories in 5-year intervals), education (3
categories - low, medium, high)

There are three interactions that are signficant on
univariate analysis - gender*income, gender*educn,
gender*age category.


The final model should look like this

.xi: logisitic screentest gender educn income agecat
i.gender*i.educn i.gender*i.income i.gender*i.agecat


Now this will provide the following co-efficiencts

gender_1
income_2
income_3
educn_2
educn_3
agecat_2
agecat_3
agecat_4
_gen_educn2
_gen_educn3
_gen_income2
_gen_income3
_gen_agecat2
_gen_agecat3
_gen_agecat4


Now, if i want the true odds ratios for gender (ie.
male vs. female), what command do I use to estimate
this from the model?

I want my output table to look something like this...


Income           OR for male vs. female
----------------------------------------
Income1               OR1
Income 2              OR2
Income 3              OR3
----------------------------------------

This OR should be adjusted for age, gender, educn, and
the interaction between gender and age, and gender and
educn.

Can someone help me with this problem? Does it have a
solution in stata?

Thanks,
Ashwin




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